Chapter 12, Problem 40A

Interpretation Introduction

Interpretation: The equation in terms of the interacting number of moles of reactants and products is to be interpreted.

Concept Introduction: Reactants, products, and an arrow indicating the reaction's direction make up a chemical equation. A balanced chemical equation is one in which the number of atoms in each of the molecules is the same on both sides of the equation.

Answer to Problem 40A

In the chemical equation $2{\text{KClO}}_{\text{3}}\left(s\right) \to 2\text{KCl}\left(s\right)+3{\text{O}}_{\text{2}}\left(g\right)$ , the number of moles of reactant is two and the number of moles of product is five.

In the chemical equation $4{\text{NH}}_{\text{3}}\left(g\right)+6\text{NO}\left(g\right) \to 5{\text{N}}_{\text{2}}\left(g\right)+6{\text{H}}_{\text{2}}\text{O}\left(g\right)$ , the number of moles of reactant is ten and the number of moles of product is eleven.

In the chemical equation $4\text{K}\left(s\right)+{\text{O}}_{\text{2}}\left(g\right) \to 2{\text{K}}_{\text{2}}\text{O}\left(s\right)$ , the number of moles of reactant is five and the number of moles of product is two.

Explanation of Solution

The interacting particles are the molecules of reactants and products taking place in a chemical equation.

Consider the given chemical equation as follows:

  $2{\text{KClO}}_{\text{3}}\left(s\right) \to 2\text{KCl}\left(s\right)+3{\text{O}}_{\text{2}}\left(g\right)$

The three moles of ${\text{KClO}}_{\text{3}}$ decomposes to give two moles of $\text{KCl}$ and three moles of ${\text{O}}_{\text{2}}$ .

The number of moles of reactant is two and the number of moles of product is five.

Consider the given chemical equation as follows:

  $4{\text{NH}}_{\text{3}}\left(g\right)+6\text{NO}\left(g\right) \to 5{\text{N}}_{\text{2}}\left(g\right)+6{\text{H}}_{\text{2}}\text{O}\left(g\right)$

The reaction between four moles of ${\text{NH}}_{\text{3}}$ and six molecules of $\text{NO}$ gives five moles of ${\text{N}}_{\text{2}}$ and six moles of ${\text{H}}_{\text{2}}\text{O}$ .

The number of moles of reactant is ten and the number of moles of product is eleven.

Consider the given chemical equation as follows:

  $4\text{K}\left(s\right)+{\text{O}}_{\text{2}}\left(g\right) \to 2{\text{K}}_{\text{2}}\text{O}\left(s\right)$

The four moles of $\text{K}$ reacts with one mole of ${\text{O}}_{\text{2}}$ to give two moles of ${\text{K}}_{\text{2}}\text{O}$ .

The number of moles of reactant is five and the number of moles of product is two.